You should look at the Onix Rocket UFW-10. It is a little bit more, but it is the real deal. It wouldn't be my first choice for HT applications. But for music it is very quick and articulate. I get response into the mid-20s, but not much below that. Another nice thing is the one band parametric eq that is very helpful at taming any peaks you might have, especially at or near the xover point.
Oz
Oz